基于匹配追踪算法的强屏蔽剥离技术在樊159井区储层预测中的应用

Application of the Strong Shielding Peeling Technique Based on Matching Pursuit Algorithm in the Reservoir Prediction of Fan 159 Well Block

当储层上覆地层含有厚层烃源岩等特殊地层时,这些地层在地震剖面上会呈现出强振幅特征,这会使下伏储层信息被掩盖,从而干扰储层的正常描述与预测。因此,消除强干扰对储层地震反射的影响,增强储层弱反射信号,对于提高储层预测精度,确定有利储层的空间展布有着重要意义。樊159井区位于樊东地区中西部,该区沙三下亚段和沙四纯上亚段分布高阻、高速厚层烃源岩,对下伏滩坝砂岩储层有强屏蔽作用,必须对其进行剥离。本文以樊159井区实际地震工区为例,分析了储层的地球物理特征,研究了基于层位控制的多道匹配追踪算法,实现了强屏蔽层的剥离。剖面属性对比和沿层属性分析结果表明,储层识别精度得到明显提高。

When the cap rock above the reservoir containing thick source rocks and other special strata, the reflection of the overlying strata will show strong amplitude, it will hide the reservoir information and make it present as a weak reflection, thereby interference normal description and prediction of reservoir. Therefore, eliminating the effect of interference layer on seismic reflection of reservoir, enhancing weak reflection signal is very important to improve the accuracy of reservoir prediction and determine the distribution of reservoir space. Fan 159 well block is located in the Midwest Fandong area. In this area, it containing high resistance and high speed thick hydrocarbon source rocks above the reservoir, it has a strong effect on the underlying reservoir, and it must be stripped. In this paper, we use F159 area as an example, analyses the geophysical characteristics of reservoir, study the matching pursuit algorithm based on horizon control, and finally peel off the strong shielding layer. We compared the section attributes and horizon attributes, it can be found that the recognition accuracy of reservoir is obviously improved.